<template>
  <canvas
    v-if="canvasId"
    class="ec-canvas"
    :id="canvasId"
    :canvasId="canvasId"
    @touchstart="touchStart"
    @touchmove="touchMove"
    @touchend="touchEnd"
    @error="error"
  ></canvas>
</template>

<script>
import WxCanvas from './wx-canvas'
// import * as echarts from 'echarts/dist/echarts.simple.min';
import * as echarts from './echarts.min.js'

export default {
  props: {
    // echarts: {
    //   required: true,
    //   type: Object,
    //   default() {
    //     return echarts;
    //   }
    // },
    onInit: {
      type: Object,
      default: null,
    },
    canvasId: {
      type: String,
      default: 'ec-canvas',
    },
    lazyLoad: {
      type: Boolean,
      default: false,
    },
    disableTouch: {
      type: Boolean,
      default: false,
    },
    throttleTouch: {
      type: Boolean,
      default: false,
    },
  },
  onReady() {
    this.echarts = echarts

    if (!this.echarts) {
      console.warn(
        '组件需绑定 echarts 变量，例：<ec-canvas id="mychart-dom-bar" ' +
          'canvas-id="mychart-bar" :echarts="echarts"></ec-canvas>'
      )
      return
    }

    console.log('echarts')
    console.log(this.onInit)

    if (!this.lazyLoad) this.init()
  },
  methods: {
    init() {
      const _this = this
      const version = wx.version.version.split('.').map((n) => parseInt(n, 10))
      const isValid =
        version[0] > 1 ||
        (version[0] === 1 && version[1] > 9) ||
        (version[0] === 1 && version[1] === 9 && version[2] >= 91)
      if (!isValid) {
        console.error(
          '微信基础库版本过低，需大于等于 1.9.91。' +
            '参见：https://github.com/ecomfe/echarts-for-weixin' +
            '#%E5%BE%AE%E4%BF%A1%E7%89%88%E6%9C%AC%E8%A6%81%E6%B1%82'
        )
        return
      }

      // if (!this.onInit) {
      //   console.warn('请传入 onInit 函数进行初始化');
      //   return;
      // }

      const canvasId = this.canvasId
      this.ctx = wx.createCanvasContext(canvasId, this)

      const canvas = new WxCanvas(this.ctx, canvasId)

      this.echarts.setCanvasCreator(() => canvas)

      const query = wx.createSelectorQuery().in(this)
      query
        .select(`#${canvasId}`)
        .boundingClientRect((res) => {
          if (!res) {
            //setTimeout(() => this.init(), 200);
            return
          }
          _this.$emit(
            'emitInfos',
            { canvas, width: res.width, height: res.height },
            function (val) {
              _this.chart = val
            }
          )
        })
        .exec()
    },
    canvasToTempFilePath(opt) {
      const { canvasId } = this
      this.ctx.draw(true, () => {
        wx.canvasToTempFilePath({
          canvasId,
          ...opt,
        })
      })
    },
    touchStart(e) {
      const { disableTouch, chart } = this
      if (disableTouch || !chart || !e.mp.touches.length) return
      const touch = e.mp.touches[0]
      chart._zr.handler.dispatch('mousedown', {
        zrX: touch.x,
        zrY: touch.y,
      })
      chart._zr.handler.dispatch('mousemove', {
        zrX: touch.x,
        zrY: touch.y,
      })
    },
    touchMove(e) {
      const { disableTouch, throttleTouch, chart, lastMoveTime } = this
      if (disableTouch || !chart || !e.mp.touches.length) return

      if (throttleTouch) {
        const currMoveTime = Date.now()
        if (currMoveTime - lastMoveTime < 240) return
        this.lastMoveTime = currMoveTime
      }

      const touch = e.mp.touches[0]
      chart._zr.handler.dispatch('mousemove', {
        zrX: touch.x,
        zrY: touch.y,
      })
    },
    touchEnd(e) {
      const { disableTouch, chart } = this
      if (disableTouch || !chart) return
      const touch = e.mp.changedTouches ? e.mp.changedTouches[0] : {}
      chart._zr.handler.dispatch('mouseup', {
        zrX: touch.x,
        zrY: touch.y,
      })
      chart._zr.handler.dispatch('click', {
        zrX: touch.x,
        zrY: touch.y,
      })
    },
  },
}
</script>

<style scoped>
.ec-canvas {
  width: 100%;
  height: 100%;
  flex: 1;
}
</style>
